Electric signal-lamp.



W. J. WARDER, Jn.

ELECTRIC SIGNAL LAMP.

APPLIOATION FILED Nov. 6, 1911.

Patented Sept. 3., 1912 32%. www.

Unrrnnsrnrns PATENT OFFICE.

WALTER El Jnjor estraneo, rumors, Assrenon. rro THE Dans a wns'r- LAKn coureur, A Conronxrlon or ILLINoIs.

. -nnncrnc SIGNAL-Leur.

To all whom t may comm." y

Be it blown that I, WALTER J. WARDER, Jr., a citizen of the United States. and resident of Chicago, county of Cook, and State Y of Illinois, have invented certain newv and useful Improvements ini Electric Signal- ,Lamps,\of which the fdlhawing is a specification, and which are illustrated in the accompanying drawings, forming a part thereof.

The invention relates to electric signal vis hereinafter described and is illustrated in the accompanying drawings, in which- Figure 1 is a plan section of thel lamp casing taken on the horizontal diameter'of the lens; Fig. 2 is a bottomplan view of the bulb support, showing the electric and magnetic' means for shifting the bulbs; Fig. 3

is a detail in perspective, partly diagrammatic, of the shifting mechanism; and Fig.

. 4 is a detail of the controlling mechanism showing the parts in a different from that of Fig. 2. s

In signal service.A it is of the utmost importance that the lights befreliablaas the failure of a. signal may result in serious disaster. Incandescent. electric lamps are open tothe objection that they may fail suddenly by the breakingof the filament, and it has therefore been inexpedient to use position lights of this character, notwithstanding their convenience and eticiency in other respects.

'The present invention provides for the luse of a plurality of bulbs, one ot which is located on the axisof the lens, means being provided for moving this bulb out of the positlon of service and substituting another one should the filament of the .former be broken--the transferring action being induced by the failure ofthe lamp.

The body of the lamp may be of any [suitable form. There is shown in the drawings at 10 an ordinary semaphore lamp havlng a lens 11. Within the lamp there is located a casing 12 for carrying the inl pecication of Letters Patent. Application led November 6, 1911. Serial No. 658,791.

Patented sept. 3f, i912.

candescent bulbs and housing the controlling mechanism. In the preferred form of construction a pair of'lamp sockets 13, 14, are mounted upon a plate 15 fixed upon a tubular shaft 16 journaled vertically in the top Awall of the casing12 insuch position that either of thebulbs 17, 18, mounted in the sockets mayy be kbrought in line withthe axis of the lens 11. Asegmental plate 19 isxed upon the lower end of the shaft 16, and carries. on its periphery. a cord 20 attached to a retract-ing spring 21 suitably anchored to v the casing 12.l Theplate 19 is held-'inone of its positions,- against the pull of the spring 21, by means of a trigger 22 engaging the notch 23 in the ed'ge of the plate. When the plate 19 is retracted vthe bulb 17 is in the position of service.v Upon the release of the trigger the spring 21 turns the shaft 1.6 to bring the bulb 18 to service position. The trigger 22 is mounted rigidly with anarmature 24, coperating with a double coil magnet which may be conven- -iently housed within a sheath 25. The two coils are reversely wound, and one of them is in multiple and the other in series with the bulb 17. VWhe-n the lamp is vin service I there is no magnetic action, as each of the coils neutralizes the other. Should the filament of the bulb 17 be broken the current will, of course, cease to flow through the series coil, whereupon the multiple coil becomes effective to energize the magnet and attract lthe armature 24, disengaging the trigger 22 from the plate 19, whereupon, under ythe iniuence4 of the spring 21, the defective bulb is swung out of service position, the bulb 18 taking its place. The circuit to the latter vbulb is closed by t-he same movement, one of the lamp lines 26 leading to a binding post 27 on the plate 19 and a` post 28, also mounted on the plate, making contact with a switch arm 29 connected` by means of a wire 30, with one of the binding posts 31, to which the line wires lead. The binding posts 31, 32, may be mounted upon the casing 12, the line wires 33, 34, leading thereto through a suitable aperture 35 in the wall of the lamp. The line 36 leads from ene of the binding posts, as 32, through the shaft 16 vtol each of the bulb sockets. The retiirnline'? 'from the bulb 17 leads through the shaft 16 to one of the magnet coils and thence to the other binding post, as 31. A line 38 directly connects the two binding posts and forms the other coil of the magnet. By this arrangement of Wiring the circuit is at all times closed through the bulb 17 While the filament of the latter retains its integrity. `When 'the plate 19 is retracted, occupying the position illustrated in Figs.' 2 and 3, the circuit to the bulb 18 is open. `Breakage of the filament of the bulb 17 causes the release of the trigger, whereupon the bulb 18 is moved to service position and the circuit through it is closed.

The switch 29 is spring-advanced, thus insuring its firm contact with the'post '28. Preferably a shoulder 39 is formed on lthe hub of the switch to limit the movement of the post 28.

I claim as my invention- In an electric signaling device in combination an oscilla-table plate, a spring urging the plate in onei direction, a detent for holding the .plate in opposition to the spring, an electric circuit, two incandescent bulbs mounted on the plate and connected With the circuit in multiple, .anelectromagnet in independent shunt from the circuit for releasing the detent, a counter coil on the electro-magnet in series with one of the bulbs, ,and a\switch in the line of the other bulb arranged to be closed by the movement of the plate by the spring.

WALTER J. VVARDER, JR.

Witnesses:

LOUIS K. GILLsoN, E. M. KLATCHER. 

